Guide specifications

Console Water Source Heat Pumps

HVAC Guide Specifications

Size Range: 7,800 to 16,000 Btuh Cooling Capacity

10,400 to 19,300 Btuh Heating Capacity

Carrier Model Number: 50KQL

Part 1 — General

1.01SYSTEM DESCRIPTION

A.Install Water Source Heat Pumps, as indicated on the plans with capacities and characteristics as listed in the schedule and the specifications that follow. Units shall be Carrier model 50KQL.

B.Units shall be individually packaged with wooden skid covered with protective corner posts and plastic stretch wrapping for maximum protection.

1.02QUALITY ASSURANCE

A.All equipment listed in this section must be perfor- mance rated and certified in accordance with ARI/ISO Standard 13256-1, and safety listed in accordance with NRTL or CSA. All units shall have ARI/ISO and NRTL or CSA labels.

B.All units shall be factory tested under normal operat- ing conditions at nominal water flow rates. Units which are tested without water flow are not accept- able. Standard operating range is 60 to 95 F enter- ing water temperature.

Part 2 — Product

2.01EQUIPMENT

A.Heat Pump Assembly:

Factory-tested and assembled single-piece packaged heating and cooling heat pump units shall be factory wired, charged with Non-CFC R-22, contain refrig- erant-to-water heat exchanger, air-to-refrigerant heat exchanger, 4-way reversing valve, fan motor assem- bly, compressor, TXV metering device, and all inter- nal controls and safety devices.

B.Unit Cabinet:

1.The cabinet shall be constructed of heavy gage steel with welded corner bracing. A removable front cabinet allows easy service access to the chassis. The cabinet shall have a 30-degree sloped top with an aluminum rigid bar type dis- charge grille.

2.An access door shall be provided to cover the swing down control section. For all capacities of the Console Heat Pump, the cabinet shall be one size (48 in. L x 12 in. D x 24 in. H).

3.Options include a locking control panel for added security; a bottom or front return with left or right hand configurations for ease of installation. Available with 3 or 5 in. subbase, with or without motorized damper.

4.The cabinet shall be powder painted.

5.Optional mute package shall consist of addi- tional sound attenuating materials strategically applied to the compressor compartment, and

substitution of 1/2 in. noise dampening insula- tion for all surfaces that normally have 1/4 in. insulation.

C.Fan and Motor Assembly:

The fan motors shall be multi-speed permanently lubricated, PSC (permanent split capacitor) type with thermal overload protection. To facilitate field service all units shall have a slide out fan deck and quick electrical disconnect.

D.Refrigerant Components:

1.Units shall have a sealed refrigerant circuit includ- ing a hermetic compressor, a refrigerant meter- ing device, a finned tube refrigerant-to-air heat exchanger, a reversing valve, a coaxial (tube-in- tube) refrigerant-to-water heat exchanger, and safety controls including a high-pressure sensor, a loss-of-charge sensor to protect against loss of refrigerant, and low water temperature (freeze- stat) sensor.

2.Rotary compressors shall have thermal over- load protection and shall be located in an insulated compartment to minimize sound transmission. Units shall have the compressor mounted on isolators to reduce noise and vibra- tion transmission.

3.Refrigerant-to-air heat exchangers shall utilize enhanced aluminum fins and rifled copper tube construction rated to withstand 425 psig refrig- erant working pressure.

4.Refrigerant-to-water heat exchangers shall be of copper inner water tube and steel refrigerant outer tube design rated to withstand 450 psig working refrigerant pressure.

5.Reversing valve shall be four-way solenoid- activated refrigerant valves which shall fail to heating operation. If the unit fails to cooling a low-temperature thermostat must be provided to prevent over-cooling of the room.

6.Optional coaxial water-to-refrigerant heat exchangers shall be cupronickel.

7.Optional Extended Range for units operating with entering water temperatures below dew point. For use in operating range with entering water temperatures from 20 to 110 F.

E.Controls and Safeties:

Units which may be reset at the disconnect switch only shall not be acceptable.

1.Electrical:

A control box shall be located within the unit and shall contain controls for compressor, reversing valve and fan motor operation.